linux-kernel - [PATCH 3.10 126/143] net: fix infoleak in llc

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Message-Id: <1465122046-9645-127-git-send-email-w@1wt.eu>
Date:	Sun,  5 Jun 2016 12:20:29 +0200
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Kangjie Lu <kangjielu@...il.com>, Kangjie Lu <kjlu@...ech.edu>,
	"David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 126/143] net: fix infoleak in llc

From: Kangjie Lu <kangjielu@...il.com>

commit b8670c09f37bdf2847cc44f36511a53afc6161fd upstream.

The stack object “info” has a total size of 12 bytes. Its last byte
is padding which is not initialized and leaked via “put_cmsg”.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/llc/af_llc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/llc/af_llc.c b/net/llc/af_llc.c
index c3ee805..9d14059 100644
--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -626,6 +626,7 @@ static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
 	if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
 		struct llc_pktinfo info;
 
+		memset(&info, 0, sizeof(info));
 		info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
 		llc_pdu_decode_dsap(skb, &info.lpi_sap);
 		llc_pdu_decode_da(skb, info.lpi_mac);
-- 
2.8.0.rc2.1.gbe9624a